Matcher 在 Java 中有一个 AnchoringBounds()方法，示例
原文:https://www . geeksforgeeks . org/matcher-hasanchoringbounds-method-in-Java-with-examples/
匹配器类的 hasAnchoringBounds() 方法用于检查该匹配器是否有锚定边界。通过锚定边界，这意味着匹配者将匹配像^这样的锚，如果锚定边界设置为真，匹配者将获得$ 1。此方法返回一个表示相同内容的布尔值。
语法:
public boolean hasAnchoringBounds()
参数:该方法不取参数。
返回值:这个方法返回一个布尔值，说明这个匹配器是否有锚定边界
下面的例子说明了 Matcher.hasAnchoringBounds()方法:
例 1:
// Java code to illustrate hasAnchoringBounds() method
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
// Get the regex to be checked
String regex = "(Geeks)";
// Create a pattern from regex
Pattern pattern
= Pattern.compile(regex);
// Get the String to be matched
String stringToBeMatched
= "GeeksForGeeks Geeks for For Geeks Geek";
// Create a matcher for the input String
Matcher matcher
= pattern.matcher(stringToBeMatched);
// Check if this matcher has anchoring bounds or not
// using hasAnchoringBounds() method
System.out.println("Does this matcher"
+ " has anchoring bounds: "
+ matcher.hasAnchoringBounds());
}
}
输出:
Does this matcher has anchoring bounds: true
例 2:
// Java code to illustrate hasAnchoringBounds() method
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
// Get the regex to be checked
String regex = "(F*F)";
// Create a pattern from regex
Pattern pattern = Pattern.compile(regex);
// Get the String to be matched
String stringToBeMatched
= " FGF GFG GFG FGF";
// Create a matcher for the input String
Matcher matcher
= pattern.matcher(stringToBeMatched);
// set the anchoring bounds to true
matcher = matcher
.useAnchoringBounds(false);
// Check if this matcher has anchoring bounds or not
// using hasAnchoringBounds() method
System.out.println("Does this matcher"
+ " has anchoring bounds: "
+ matcher.hasAnchoringBounds());
}
}
输出:
Does this matcher has anchoring bounds: false
参考:https://docs . Oracle . com/javase/9/docs/API/Java/util/regex/matcher . html # hasAnchoringBounds–
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